This is pinouts for most 5.25 and 3.5" floppies that have 1 or 4 selects (excluded most current 3.5" that use twist cable select). NC(speedsel in 1.2mb) < 2 - chng nc(hd load) < 4 - inuse 1 drive sel3 < 6 - inuse 0 < 8 - index <10 - sel 0 <12 - sel 1 drive sel2 <14 - inuse 1 (yes, it's tied to pin 4 on <16 - mtron <18 - dir <20 - step writedata 22 wrtgate 24 track00 26 write pro 28 head sel 32 disk change 34